Tangerine dream: Kim Kardashian showed off her curves in an orange bikini on a Mexican beach last month

She is famous for her curvy figure, and Kim Kardashian ensured she showed it off to the maximum on a recent holiday to Mexico.The 31-year-old star sported an eye-catching halterneck orange bikini as she hit the beach with older sister Kourtney and her two-year-old nephew Mason. But Kim was not content to just spend the day sunbathing - instead trying her hand at bodyboarding in the warm ocean. And she certainly seemed to be taking to the sport like a duck to water, laughing as she cruised in to shore on her bright yellow boogie board.The star also let her hair down for a stroll down the beach, and looked pensive as she shielded her eyes from the sun. Kim was clearly enjoying spending time with nephew Mason, carrying the smiling little boy as she splashed around in the water.

Surf's up: Kim looked pensive as she strolled down the beach barefoot in her eye-catching two piece

At one point, she and Kourtney swung delighted little Mason up and down as they walked down the near-deserted beach, before heading back to their private villa. He was dressed in black swimming trunks and a black hat with orange detail which matched his auntie Kim's swimming costume. Mother Kourtney meanwhile, dressed her growing baby bump in a black swimsuit and sheer patterned wrap.

Making a splash: Kim shrieked with delight as she hit the waves in Mexico with her bodyboard

She kept herself protected from the sun in a straw coloured hat with black ribbon.The sisters were in Mexico to celebrate Kourtney's 33rd birthday, but were without Mason's father Scott. However, the sisters were joined by Kim's friends Robin Antin and Carla DiBello, who also tried their hands at bodyboarding.

No slip up: Kim's orange two piece luckily stayed firmly in place as she hit the waves

Robin, an entrepreneur, actress and choreographer, who founded girl group The Pussycat Dolls, wore a patterned blue and purple bikini to splash around in the surf, while reality show producer Carla wore a lilac bikini. Kim is regularly seen heading to the gym near her home on Los Angeles, and the results were clear to see as she displayed her washboard stomach and toned legs. She admitted last month that she is working out up to six times a week to keep her famous figure in shape and has been changing her diet for the better.

Sister act: Kim was accompanying her sister Kourtney who is pregnant with her second child by boyfriend Scott Disick

A swinging time: Mason, two, was clearly enjoying spending his holiday with his mother and auntie

Kim wrote via Twitter: 'I've been trying to change my bad eating habits - slow process but its working. I feel so much better! Sugar, dairy & gluten free. HARD!'She added: 'I will have sweets every once in a while & dairy but this is a huge step for me! Its a lifestyle change but I'm loving it so far!'Kim clearly appreciated the break, while divorce proceedings from estranged husband Kris Humphries are still ongoing.